In the world of project management, it is rare that a project goes from the planning stages through to implementation without a hiccup or two along the way. As the manager of the project, you are ultimately responsible for keeping the project on task and your interviewer is looking to hear how you will do that for the clients at GHD Group. One important thing to consider highlighting is your ability to monitor and track progress regularly so the train doesn't get too derailed off the tracks. As well, you can talk about your ability to think on your feet, problem solve and coach others to bring tasks back up to date.
